Plain or satchel bag-making machine



April 7, 1942. (5. w. FRENCH 2,279,279

PLAIN OR SATCHEL BAG-MAKING MACHINE I Filed Aug. 19, 1939 INVEHT Q G .w. FZEHCH I PE? 1 A ATTOQHEYS Patented Apr. 7, 1942 PLAIN on SATCHEL BAG-MAKING; MACHINE Gordon William French, Bristol, England, as-

signor. to Beasley,

ited, Bristol, England Application August 19, In Great Britain French and Company Lim- 1939, Serial No. 291,048 September 1, 1938 1 Claim. (01. 93-20.)

This invention comprises improvements in and relating to plain and satchel bag-making machines of the type in which paper and like bags are made from a continuous web of paper or other suitable material folded and seamed into continuous tubular form and then fed to mechanism which severs the tubular material into suit able lengths in a manner ing mechanism to operate tube to form the bags. The machines are of the high speed automatic type. a

The primary object of the present invention is to enable a number of bags to be made side by side on a normal width machine thus economising in the cost of producing bags of small dimensions.

In present practice bag-making machines of the type described capable of making large bags will only operate when making small bags to provide a single line of bags from a single tube of material. The present invention therefore proposes a method and arrangement to enable small bags to be manufactured side by side on a machine the maximum capacity of which is sufficient for making bags of a size at least equal i to the two or more small bags which may be made thereon according to the present invention.

Another object of this invention is to provide a paper-bag-making machine for plain, satchel type or block bottom bags with means arranged to fold and also seal the appropriate edges of .sheet material into a number of tubes to be cut into bag lengths within the capacity normally available for a single wide classof bag, whereby sets of bags narrower of bag can be produced simultaneously instead of asingle set of the wide class of bag.

In carrying the invention into practice a machine for making plain, satchel type, or block bottom bags is arranged to enable the paper or other suitable material to be folded and seamed into two or more tubes arranged side by side as an alternative to the normal arrangement which enables one such tube only to be worked on .a

given machine. In one embodiment taking for example two tubes arranged side by side, the material is folded so that the seams in the tube are at or near the inner or adjacent edges of the two tubes. By this means the two tubes may be kept close together and within the position normally occupied by a single tube of little more than double the size of one of the two tubes without any necessity for deflecting the paper or other material from its normal line. The two or more tubes of material may be made up from than the said wide class to enable bottom folda to seal one end of the employ a single roll two or more separate reels of paper or other suitable material or a single reel may be used and passed over or through suitable cutting or slitting mechanism to divide the web of paper or other suitable material longitudinally into the required number of strips which are then fed to the folding mechanism for folding them into the two or more tubes. The separate webs of material or the single web divided into anumber of stripsmay, if desired, be of equal width or the widths of the two or more strips may vary. In this way two or more sets of bags of equal dimensions may be formed side by side on the machine or alternatively paper bags of different widths may be formed simultaneously on the same machine. The folding mechanism material into tubular form is so arranged that the inner edges of the strips are folded overto form a relatively narrow strip whilst the other side is folded over to an extent equal to or almost equal to the full width of each aper bag. The folding operation is arranged so that the strips of material are folded over a suitable former plate. Two or more sets of pasting mechanism are provided in suitable positions to paste the seamed joints of the tubes. The tubes of folded material then pass along separate former plates in the usual manner to the cutting and folding mechanism which severs the upper and lower portions of each tube preferably in stepped formation so as to enable the folding mechanism to fold the cut-off sections of tubular material so as to produce an effective seal at the bottom ofthe bags.

The cutting mechanism for severing the sections of tube for formation into individual bags may be of the type in which a pair of rotary cutters makeseparate cuts in the upper and lower sides of the tubular sheet material, the two outs being arranged in stepped relationship to each other so as to form the ends of the bags at one operation.

In order that this invention may be clearly understood and readily carried into effect, a sheet of drawings is appended hereto illustrating an embodiment thereof, and wherein- Fig. 1 is a side elevation view of the slitting and tube forming means.

Fig. 2 is a plan view of the slitting device and tube forming plates.

Fig. 3 is a detail sectional front view of the preferred form of the slitting device.

Referring to the drawing it is preferred to of paper I, the unwound paper 2 being passed over the usual feeding for folding the strips of at the required positions, e. g.,

-by the shaded parts than two The cutting or ,slitting mechanism may as rolls to a pasting stage 3 where a pair of axially spaced suitable paste wheels I (only one being visible) apply lines of paste to the web of paper along the outer edges thereof, the-lines'of paste being indicated 5 in Fig. 2. The pasted web suitable .rollersi to hold it taut and is then fed past a cutting or slitting stage 1 whereby the web. of paper is divided longitudinally'into a. pair of strips 2a, 2b. The .paper web is thus divided of similar or dissimilar widths each having a pasted edge 5 ready to be passed to the folding stage 8 where each strip is folded into tubular form. Each folding mechanism is of any suitable well known type and is shown as comprising a parallel pair of former plates 9 and I 0 and then passes around into a pair of strips which is held or urged into resilient contact j two pairs of rubber surfaced wheels l8, I9,

and 2|, known as tubing wheels. The rubber treads of these wheels revolve freely simply by contacting the paper, the proportions of paper folded 'on either side of each plate being determined by the position of the plates 9 and ID in relation to the web of paper, the wheels I8, I 9, 20 and 2| ensuring that the paper is wrapped snugly round the plates, the folding being assisted by the axes of the rollers being inclined in relation to the longitudinal edges of the plates 9 and I0 as shown in Fig. 2, the folding being such that the seams II in the individual tubes are at or near the adjacent edges of the tubes. This minimises the space. I! between the former plates and enables the total width of thetubes to be kept within the maximum width of a single tube of paper which the machine is capable of handling and at the same time enabling two series of bags to be produced side by side thus utilising the maximum capacity of the machine even when making bags of relatively small dimensions. 'By adding to the number of slitting stages, former plates and pasting rollers more lines of tubes can be produced.

shown in Fig. 3 conveniently comprise one driven wheel or roller I3 of steel or other suitable material having one face slightly recessed or undercut as at ll so as to form a relatively sharp edge at the periphery of the roller, and a cutting disc l5 having a bevelled edge the face of ,suring an effective cutting with the wheel or roller, e. g., by a coiled compression spring l1. Either the roller or disc or both may be rotated mechanically but preferably one isrotated positively and the other is driven by the frictional contact therewith. The roller and disc arepreferably arranged so that their peripheries overlap'each other slightly thus enor slitting of the material.

When the lengths of tubular material are of uniform width the customary cutting rolls can be employed which normally with a single length of tubing cut the tubular material transversely at stepped parts to afford flaps for folding over and closing the base ends of the bag sections, the normal transverse blade in each cutting, roll being removed from its appropriate securing device and a pair of shorter blades fitted in lieu thereof. The cutting rolls can be speeded up as desired by existing known means to shorten the length of each bag section as required. When bags of difierent width but uniform length are to be produced the same method may be adopted but when sets of bags of distinctive length are required, a special cutting device can be substituted for the normal and embody separately driven pairs of cutting rolls each driven at a In a machine for making plain, satchel type or block bottom bags, the combination with slitting means adapted to slit the sheet material into longitudinal side by side continuous strips of means to apply. to the outer edges of the strips marginal coatings of an adhesive, means to fold relatively narrow inner marignal edges of the strips away from each other, and means to fold relatively wide parts of the strips towards the said relatively narrow marginal folded inner edges so as to obtain separate tube forming seams in close proximity to each other.

GORDON WILLIAM FRENCH. 

